NEBNext for Ion Torrent - LIBRARY PREPARATION KITS
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NEBNext for Ion Torrent
® ™
LIBRARY PREPARATION KITS
NEBNEXT PRODUCTS FOR ION TORRENT
Table of Contents TOOLS & RESOURCES
Visit NEBNext.com to find:
3 General Introduction • T he full list of products available
• P rotocols & FAQs
• O
nline tutorials to help with product
4–5 DNA Library Preparation Workflow selection, general handling tips and
more
• N
EBNext citations
6 Product Selection
6–7 Product Details
8–9 Additional NEBNext Features
10 Technical Tips
11 Ordering Information
2
NEBNEXT PRODUCTS FOR ION TORRENT
The NEBNext suite of products supports Ion Torrent sequencing with library preparation tools
the nebnext advantage
that streamline workflows, minimize inputs, and improve library yields and diversity. DNA
library preparation is complete in approximately 2 hours, with minimal hands-on time. In • Broad range of input amounts,
addition to the extensive QCs on individual kit components, all NEBNext kits for Ion Torrent from low ng to µg
are functionally validated by preparation of a library, followed by Ion Torrent sequencing.
• Fast workflows with minimal
hands-on time
NEBNext for Ion Torrent formats: • Gel-free workflows
Sets include reagents for the entire library preparation workflow, and include master mix • High yields
reagents that minimize the number of components and pipetting steps.
• High library diversity
• Minimized GC bias
Bulk & Custom formats: • Convenient formats include kits
Choose NEBNext’s bulk and custom formats when your reagent needs exceed standard and modules
volumes, or you require a specialized formulation. As enzyme manufacturers, we are able to
• All reagents undergo stringent quality
easily provide customized reagents, kits and modules to meet your specific NGS library prep
controls, plus sequencing validation
workflow needs. For more information, please contact NEBsolutions@neb.com.
• Value pricing
3
DNA WORKFLOW
Workflow for Ion Torrent
DNA Library Preparation
Recommended input amounts Total DNA DNA
PCR Primers
NEBNext Fast DNA Library Prep Set for Ion Torrent 10 ng – 1 µg P1 Adaptor
A Adaptor P 5´ Phosphate
NEBNext Fast DNA Fragmentation & Library Prep Set for Ion Torrent 10 ng – 1 µg
1 DNA Fragmentation
The first step in DNA library preparation is generally fragmentation of purified DNA. Fragmentation can be accomplished by a
number of methods including acoustic shearing, nebulization and enzyme-based methods, such as dsDNA Fragmentase®. All of
these methods leave a mix of 3´ and 5´ ends (recessed, overhang, blunt) which may or may not be phosphorylated. NEBNext kits
for Ion Torrent are available with or without enzyme-based fragmentation reagents, allowing a choice of fragmentation method.
5´ 3´
3´ 5´
5´ 3´ 5´ 3´
3´ 5´ 3´ 5´
2 End Repair and 5´ Phosphorylation
Blunt-ended fragments are created by filling in or chewing back 3´ and 5´ overhangs. Phosphorylation of the 5´ ends ensures the
fragments are suitable for ligation.
5´ 3´
3´ 5´
5´ 3´ 5´ 3´
3´ 5´ 3´ 5´
3 Adaptor Ligation and Nick Translation
Short adaptor sequences are added to the ends of the DNA fragments by blunt-end ligation. The adaptors are not 5´ phosphory-
lated, in order to minimize adaptor-dimer formation. Since ligases require a 5´ phosphate for ligation, this absence of 5´ phosphate
results in a nick on one strand at each ligation site. This nick is repaired by nick translation, using Bst 2.0 WarmStart™ DNA Poly-
merase. The four possible reaction products are shown below.
P1 A
5´ P 3´ 5´ 3´ 5´ 3´
3´ P 5´ 3´ 5´ 3´ 5´
5´ 3´ 5´ 3´
3´ 5´ 3´ 5´
5´ 3´ 5´ 3´
3´ 5´ 3´ 5´
5´ 3´ 5´ 3´
3´ 5´ 3´ 5´
5´ 3´ 5´ 3´
3´ 5´ 3´ 5´
4
DNA WORKFLOW
4 PCR Enrichment
Finally, amplification using a high-fidelity polymerase is performed, resulting in a robust library suitable for sequencing.
This step has multiple functions:
• S election for molecules with the proper adaptor at each end
• Increase the amount of library
• I ncorporation of sequences required downstream in the sequencing workflow, and, when desired, barcodes/indices to enable
multiplexing. NEBNext kits for Ion Torrent are not supplied with barcode adaptors, but are compatible with adaptors from
other sources, including Ion Xpress™ Barcode Adaptors from Life Technologies.
5´
5´ 3´
3´ 5´
5´
5´ 3´
3´ 5´
5´ 3´
3´ 5´
5´ 3´
3´ 5´
5´ 3´
3´ 5´
5´ 3´
3´ 5´
5´ 3´
3´ 5´
5
NEBNEXT PRODUCTS FOR ION TORRENT
Product Selection
Designed with the user in mind, NEBNext kits maximize efficiency and convenience. For use with Ion Torrent, NEBNext kits are available with
or without fragmentation reagents, allowing the user to choose the method of fragmentation. For maximum convenience and ease of scale-up,
the NEBNext Fast DNA Fragmentation & Library Prep Set for Ion Torrent (NEB #E6285) includes a master mix for enzyme-based fragmenta-
tion. This set contains dsDNA Fragmentase, a mix of two enzymes for random DNA shearing, described on page 9, and this is combined with
End Repair reagents for a streamlined workflow. When mechanical shearing methods, such as Covaris® acoustic shearing or nebulization are
preferred, the NEBNext Fast DNA Library Prep Set for Ion Torrent (NEB #E6270) is the recommended choice. The components and proto-
col for this kit have been optimized for the volumes and concentrations of DNA sheared by mechanical methods. Both kits have the same fast
workflow and low minimum input DNA requirements.
Product Details
In addition to stringent QCs on individual components, the NEBNext DNA kits are functionally validated by library preparation of a ge-
nomic DNA library, followed by Ion Torrent sequencing. Reagent lots are reserved specifically for inclusion in NEBNext kits. Most of these
reagents are provided in master mix format, reducing the number of vials provided in the kits, and reducing pipetting steps. Adaptors and
primers for singleplex libraries are supplied in the kits. For multiplexed libraries, the Ion XPress Barcode Adaptors from Life Technologies can
be used.
Input Amount
10 ng – 1 µg*
Fragmentation/End Repair Adaptor Ligation/Fill-In PCR Enrichment
NEBNext Fast DNA Fragmentation & Library Prep Set for Ion Torrent (NEB #E6285)
Library Prep Set
• DNA Fragmentation • Adaptors for Ion Torrent • Primers for Ion Torrent Hands-On Time
Master Mix • T4 DNA Ligase • NEBNext High-Fidelity 12 min.
• DNA Fragmentation • T4 DNA Ligase Buffer 2X PCR Master Mix Total Time
Reaction Buffer for Ion Torrent (10X) 110 min. – 133 min.
• Bst 2.0 WarmStart
DNA Polymerase
NEBNext® Fast DNA Library Prep Set for Ion Torrent™ (NEB #E6270)
Library Prep Set
• End Repair Enzyme Mix • Adaptors for Ion Torrent • Primers for Ion Torrent Hands-On Time
• End Repair Reaction Buffer • T4 DNA Ligase • NEBNext High-Fidelity 12 min.
(10X) • T4 DNA Ligase Buffer 2X PCR Master Mix Total Time
for Ion Torrent (10X) 110 min. – 133 min.
Reagents for Fragmentation • Bst 2.0 WarmStart
are not included DNA Polymerase
* Note that a minimum of 100 ng is recommended when used in conjunction with Ion Xpress Barcode Adaptors.
Library Preparation workflow for Ion Torrent is complete in approximately 2 hours
Input Workflow
Amount Time Time
Fragmentation/ Adaptor Clean Up/ Amplification Clean Up
End Repair/ Ligation/ Size Selection (Optional)
Heat Inactivation Nick Translation
Hands-On Hands-On
10 ng – 2 min. 1 min. 5 min. 1 min. 3 min. 12 min.
1 µg Total Total
30 min. 20 min. 44 min. 0 – 23 min. 16 min. 110 – 133 min.
6
NEBNEXT PRODUCTS FOR ION TORRENT
Sequencing Data
A B
A typical Ion Torrent run report for libraries made from E. coli (K12 MG1655 strain) genomic DNA using NEBNext Fast DNA Fragmentation & Library
Prep Set for Ion Torrent. A. Alignment Summary. 72 Mb of data was generated, with an average genome coverage of 15.5 X, from approximately 0.5
Million 200 bp reads. B. Read length histogram from 200 bp run.
Varying GC Content Libraries
Haemophilus influenzae (38% GC) Escherichia coli DH10b (51% GC) Rhodopseudomonas palustris (65% GC)
Insert Size
~ 200 bp
Insert Size
~ 400 bp
0.5 mg of DNA from 3 different genomes with varying GC content were used to construct 200 bp and 400 bp libraries using the NEBNext Fast DNA Fragmentation and Library Prep Set for Ion
Torrent, analyzed by the Agilent® Bioanalyzer®.
7
ADDITIONAL NEBNEXT FEATURES
Minimized GC bias with the NEBNext Formulation of Q5® High-Fidelity
DNA Polymerase
To ensure that sequence data reflects exactly the sequence of the original sample, it is essential that amplification of libraries be performed
evenly and with high fidelity. Historically, high-fidelity polymerases have been more susceptible to difficulties in PCR amplification of GC-rich
and other challenging regions. If such bias occurs in library amplification, this can lead to uneven sequence coverage, challenges in sequence
assembly and even “missing” sequence.
To minimize GC bias, NEB offers the NEBNext High-Fidelity 2X PCR Master Mix (NEB #M0541). This master mix is specifically optimized
for robust, high-fidelity amplification of next-generation sequencing libraries, regardless of GC content. This unique formulation combines
the ultra low error rates of Q5 High-Fidelity DNA Polymerase with specific buffers and reaction enhancers to support robust amplification of
a broad range of templates, even those with high GC content. The buffer component of the master mix has been optimized for robust, even
amplification of NGS libraries, including GC-rich amplicons. This combination makes NEBNext High-Fidelity 2X PCR Master Mix an ideal
choice for your NGS library construction.
NEBNext High-Fidelity 2X PCR Master Mix minimizes GC bias and error rate
Coverage of Difficult Regions Fidelity
30 NEBNext (Q5)
12
20
10 10
Fidelity Relative to KAPA HiFi
0
8
Number of Reads
30 KAPA HiFi™
6
20
4
10
0 2
30 Phusion 0
5)
q
i
iF
Ta
20
(Q
H
PA
t
ex
KA
N
EB
10
N
0
89% Known Low Coverage Regions (by GC%) 55%
Fidelity measurements of Taq DNA
Polymerase (in Standard Taq Buffer), KAPA
HiFi HotStart ReadyMix and NEBNext
Indexed human IMR90 DNA libraries were split and amplified using 8 cycles of PCR with Phusion High- High-Fidelity 2X PCR Master Mix were
Fidelity PCR Master Mix with HF™ Buffer, KAPA HiFi® HotStart ReadyMix or NEBNext High-Fidelity 2X PCR measured, side-by-side, in a PCR-based
Master Mix, followed by sequencing on an Illumina® HiSeq™ 2000. 180 million reads were randomly mutation screening assay using a lacZ
extracted from each data set and the number of reads overlapping distinct low coverage regions of the method. Values (n ≥ 2) are expressed
human genome (Aird et.al. Genome Biology, 2011) are shown for each library. relative to KAPA HiFi HotStart ReadyMix.
8
ADDITIONAL NEBNEXT FEATURES
DNA Fragmentation with NEBNext dsDNA Fragmentase
Methods for DNA fragmentation include mechanical shearing (such as acoustic shearing or nebulization) and enzyme-based fragmentation.
For this step in the DNA library preparation workflow, NEB provides NEBNext dsDNA Fragmentase, an enzyme-based reagent that generates
fragments of the desired sizes for NGS libraries in a time-dependent manner. dsDNA Fragmentase contains two enzymes; one randomly gen-
erates nicks on dsDNA, and the other recognizes the nicked sites and cuts the opposite DNA strand across from the nick, producing
dsDNA breaks. The resulting DNA fragments contain short overhangs, 5´-phosphate and 3´-hydroxyl groups. Randomness of shearing for
this application is critical, and dsDNA Fragmentase provides random fragmentation, similar to mechanical methods (1,2).
Fragmentation of HeLa cell gDNA using dsDNA Fragmentase
FU
200
Time of Digestion
15 min
20 min
30 min
150
DNA marker
100
50
0
50 100 300 500 700 1000 2000 10380
BP
5 µg of genomic HeLa DNA was incubated with NEBNext dsDNA Fragmentase for varying times as indi-
cated. Fragmented DNA was purified using MinElute® columns and analyzed by the Agilent Bioanalyzer
2100.
NEBNext dsDNA Fragmentase generates fragments in the
100–300 bp range more effectively than nebulization
FU
160
dsDNA Fragmentase
Nebulizer
140 DNA marker
120
100
80
60
40
20
0
50 100 300 500 700 1000 2000 10380
BP
Relative size distribution of E. coli DNA fragments with dsDNA Fragmentase vs. nebulization as seen
using the Agilent Bioanalyzer. The dsDNA Fragmentase sample was incubated for 30 minutes at 37°C
with 0.05 µg of DNA per µl of dsDNA Fragmentase in 1X Fragmentase Reaction Buffer with 100 µg/ml
BSA. The Nebulizer sample was prepared by nebulization of DNA in 50% glycerol for 6 minutes at 35 psi.
References
1. Kuierim, E. et al. (2011) PLOS One 6, e28240.
2. Adey, A. et al. (2010) Genome Biology 11: R119.
9
TECHNICAL TIPS
General Handling Tips tools & resources
• S pin down the vials before opening. This ensures that everything is at the bottom of Visit NEBNext.com to:
the vial and not in the lid or on the sides.
• V iew the latest videos from NEB scien-
• Use filter tips tists discussing technical tips for library
• Use RNase- and DNase-free plastics, water, and solutions preparation
• Thaw and keep all master mixes on ice
• Keep all sample and reagent vials capped when not in use
• M
ix reaction components by pipetting gently up and down, and do not vortex
(except when using Fragmentase, which should be vortexed as described in the protocol)
• Return enzymes to the freezer after use
• Always use freshly prepared 80% ethanol
• Keep all sample and reagent vials capped when not in use
• A
lways use aseptic technique.
• Store final libraries in TE, in low-bind DNA tubes
DNA Sample Input Guidelines
Integrity of DNA
• S tart with as high quality DNA as possible. The quality of the input material directly affects the quality of the library. DNA quality can
be assessed using gel electrophoresis. Impurities such as detergents or probes, or damaged DNA can usually be seen as a smear on the gel.
RNA impurities are often seen at the bottom of the gel. Absorbance measurements can also be used as an indication of DNA purity. Ideally,
the ratio of the absorbance at 260 nm to 280 nm should be between 1.8 – 2.0. However, measurements can be affected by the presence of
RNA or small nucleic acid fragments.
Quantitation of DNA
• I t is important to accurately quantify the DNA sample prior to library construction. Fluorescence based detection which utilizes dsDNA
specific dyes, such as the Qubit® from Life Technologies, are more accurate than UV spectrometer based measurements, as the presence of
RNA or other contaminants can result in overestimation of the DNA sample.
Bead-based clean-ups and size selection
• Be careful when transferring material not to disturb the bead pellet
• Be sure to vortex the beads just before use – they should be a uniform suspension
• Do not over-dry the beads. This can make resuspension difficult and reduce yield.
10ORDERING INFORMATION
Ordering Information
KITS FOR ION TORRENT DNA LIBRARY PREPARATION NEB # SIZE
NEBNext Fast DNA Library Prep Set for Ion Torrent E6270S/L 10/50 rxns
DNA
NEBNext Fast DNA Fragmentation & Library Prep Set for Ion Torrent E6285S/L 10/50 rxns
MODULES & ENZYMES NEB # SIZE
NEBNext High-Fidelity 2X PCR Master Mix M0541S/L 50/250 rxns
DNA
NEBNext dsDNA Fragmentase M0348S/L 50/250 rxns
FRAGMENTASE®, NEW ENGLAND BIOLABS® and NEBNEXT® are registered trademarks of New England Biolabs, Inc.
HF™ and WARMSTART™ are trademarks of New England Biolabs, Inc.
QUBIT® is a registered trademark owned by Life Technologies, Inc.
ION TORRENT™ and ION XPRESS™ are trademarks owned by Life Technologies, Inc.
AGILENT® and BIOANALYZER® are registered trademarks of Agilent Technologies.
COVARIS® is a registered trademark of Covaris.
MINELUTE® is a registered trademark of the Qiagen Group.
ILLUMINA® and HISEQ® are registered trademarks of Illumina, Inc.
KAPA HIFI® is a registered trademark of Kapa Biosystems.
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